I just discovered (via blog) an amazing setting for OpenSSH: the MasterController. You can now designate an SSH invocation to run a "master" session. Then if I run SSH again connecting to the same computer, a new connection will be opened over that master session, without making a new TCP connection, establishing a new session key, or reauthenticating. This greatly speeds up connection speeds, making things like distcc a lot more practical.
I've know this was possible from using the commercial SSH for Windows on school computers, I just had no clue how to get it working from the Unix world until now.
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